John was piloting a plane behind a car but was never able to overtake it. Why?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

He loves to dance, twist and prance, he shakes his tail, and as a way he sails, wingless he flies into the sky. What is he?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

When is the top of a mountain similar to a savings account?

What time is it when an elephant sits on a fence?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Different lights make me strange by changing me into different sizes. What am I?

What jumps when it walks and sits when it stands?